CN110508771A - A kind of continuous cast method for eliminating the nearly surface layer dendrite banded segregation of alloy spring steel wire rod - Google Patents
A kind of continuous cast method for eliminating the nearly surface layer dendrite banded segregation of alloy spring steel wire rod Download PDFInfo
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- CN110508771A CN110508771A CN201910808575.9A CN201910808575A CN110508771A CN 110508771 A CN110508771 A CN 110508771A CN 201910808575 A CN201910808575 A CN 201910808575A CN 110508771 A CN110508771 A CN 110508771A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
- B22D11/114—Treating the molten metal by using agitating or vibrating means
- B22D11/115—Treating the molten metal by using agitating or vibrating means by using magnetic fields
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/166—Controlling or regulating processes or operations for mould oscillation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/20—Metals
- G01N33/204—Structure thereof, e.g. crystal structure
Abstract
The invention discloses a kind of continuous cast methods of the nearly surface layer dendrite banded segregation of elimination alloy spring steel wire rod, and the method includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, the control of crystallizer flow of inlet water and vibration parameters to control process；The Metal in Tundish degree of superheat is controlled at 15~25 DEG C by tundish electromagnetic induction heating device；M-EMS is mounted on position on the lower side in the middle part of crystallizer, and electromagnetic agitation current strength is 150~300A, 1.5~2.5Hz of frequency；Using hydraulic vibration, 2.3~2.7mm of amplitude, vibration 100~130cpm of frequency, liquid fluctuating is controlled in ± 2mm.φ 5.5~20mm alloy spring steel wire rod of continuous cast method of the present invention production through dendrite Corrosion monitoring without nearly surface layer dendrite banded segregation, metallographic structure uniformity in surface layer after heat treatment, spring early fatigue fracture caused by effectively preventing because of dendrite banded segregation.
Description
Technical field
The invention belongs to metallurgical technology fields, and in particular to a kind of nearly surface layer dendrite of elimination alloy spring steel wire rod is band-like partially
The continuous cast method of analysis.
Background technique
Alloy spring steel gren rod is mainly for the manufacture of automotive suspension spring, clutch spring, valve spring and die springs
Deng the main trades mark such as including 55SiCr, 55SiCrV, 60Si2Mn.Spring steel gren rod at least will by drawing, heat treatment,
The process such as wind spring could become the spring that finally uses, if wire rod there are a degree of gross segregation defect, may
Steel wire drawing is caused to be broken, mechanical properties of wires is uneven after heat treatment, the unstable even spring early fatigue of the spring sizes rolled out
The problems such as fracture.
The wire rod dendrite banded segregation of spring steel refers to that wire rod cross section is polished, with after bitter taste acid corrosion again at light throwing
Reason, the black bar banded structure observed under metallographic microscope, apart from wire rod surface generally at 200~700 μm, defect length
Up to 1000 μm or more, about 10~20 μm of width.Solidification interdendritic of the wire rod dendrite banded segregation heredity from the nearly surface layer of continuous casting billet
Segregation, serious dendrite banded segregation generally correspond to the subcutaneous interdendritic crackle in slab corner.Due to the richness of interdendritic solute element
Collect, P, S content are significantly higher than at normal tissue on wire rod dendrite banded segregation, increase the fracture-sensitive of material.Dendrite band
Shape segregation is also a kind of gross segregation, compared with pattern segregation and center segregation, distributing position on wire rod on nearly surface layer,
As shown in Figure 1.The continuous castings parameter such as the generation of the defect and crystallizer electromagnetic stirring strength is closely related, and is difficult in subsequent heat
Improve in treatment process and eliminates.Spring surface layer stress is maximum in helical spring work, therefore to the various defects on surface and nearly surface layer
Control is paid close attention to the most.For the suspension spring of high working stress large amplitude, die springs, fatigue fracture is controlled primarily by tired
The extension of labor crackle.If being easy to produce fatigue crack source in the position there are the dendrite banded segregation on nearly surface layer in wire rod,
Or fatigue crack is caused to extend acceleration herein, eventually lead to spring early fatigue fracture.
106399654 B of patent CN discloses a kind of method for improving spring steel pattern segregation, packet degree of superheat control in continuous casting
System is at 25~35 DEG C, continuous casting section 320mm × 420mm, 0.3~0.5m/min of pulling rate, M-EMS Current intensity 300
~450A, frequency 2Hz；Cogging is at 185mm*185mm square billet technique, then rolled wire.This method be mainly used for solve because
Product caused by pattern segregation changes the original sentence to problem, do not account for solve wire rod in there are the dendrite banded segregation defects on nearly surface layer to ask
Topic.
108672666 A of patent CN discloses a kind of Continuous Casting Square for improving round billet spring steel 60Si2CrVAT center segregation
Method, to the tundish temperature of round billet continuous casting process, crystallizer water, secondary cooling zone water and stirring parameter, end electromagnetism
Mixing position etc. is controlled, and to reduce continuous casting billet center segregation, plasticity does not conform to problem caused by reducing because of center segregation, together
Sample do not account for yet solve wire rod in there are the dendrite banded segregation defect problems on nearly surface layer.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of nearly surface layer dendrite banded segregations of elimination alloy spring steel wire rod
Continuous cast method.The nearly surface layer dendrite banded segregation of alloy spring steel wire rod is effectively eliminated in the invention, to ensure that spring is close
The uniformity of surface layer metallographic structure, and then improve the fatigue behaviour of spring.
In order to solve the above technical problems, the technical solution used in the present invention is: a kind of elimination alloy spring steel wire rod is close
The continuous cast method of surface layer dendrite banded segregation, the method includes the controls of the molten steel in bakie in continuous casting degree of superheat, continuous casting billet pulling rate control
System, M-EMS control, the control of crystallizer flow of inlet water and Oscilation Parameters of Mold control process；Among the continuous casting
Baotou steel water superheat controls process, controls the Metal in Tundish degree of superheat 15~25 by tundish electromagnetic induction heating device
℃；The M-EMS controls process, and M-EMS is mounted on position on the lower side, electromagnetic agitation in the middle part of crystallizer
Current strength is 150~300A, 1.5~2.5Hz of frequency；The Oscilation Parameters of Mold controls process, and crystallizer is using hydraulic
Vibration, 2.3~2.7mm of amplitude, vibration 100~130cpm of frequency, liquid level fluctuation of crystallizer are controlled in ± 2mm.
Continuous casting billet casting speed control process of the present invention, continuous casting billet casting speed control is in 0.65~0.75m/min.
Crystallizer flow of inlet water of the present invention controls process, and crystallizer flow of inlet water is controlled in 2600~2800L/min.
Continuous cast method crystallizer cross dimensions of the present invention is 280mm × 325mm.
φ 5.5~20mm alloy spring steel wire rod of continuous cast method production of the present invention is through dendrite Corrosion monitoring without nearly table
Layer dendrite banded segregation, metallographic structure uniformity in surface layer after heat treatment, bullet caused by effectively preventing because of dendrite banded segregation
Spring early fatigue fracture.
The detection method of the nearly surface layer dendrite banded segregation of alloy spring steel wire rod of the present invention: wire rod sample is cut first
Processing is cut, and sample is polished, after polishing such as mirror surface, room temperature in picric acid corrosive liquid is placed in and corrodes 3~5min, finally
It, can be in metallographic again to the gently throwing processing (the only black erosion and deposition object of jettisoning specimen surface) of the specimen surface after etch
The nearly surface layer dendrite banded segregation of microscopically observation.
Spring is as a kind of non-standard component, and multifarious to the test method of its fatigue behaviour, user is usually to combine bullet
Spring allowable design stress does the parameter setting of testing fatigue, such as compression travel and maximum stress, and the requirement to fatigue life
It is not quite similar, fatigue life requirements >=500,000 time of general suspension spring, fatigue life requirements >=20,000,000 time of valve spring, mold
The fatigue life requirements of spring >=300,000 time.
The beneficial effects of adopting the technical scheme are that the 1, present invention is strong by control M-EMS
Degree prevents crystallizer electromagnetic stirring strength is excessive from molten steel in mold being caused excessively to wash away green shell solidification front, generates more serious
Blank surface negative segregation, heredity to wire rod formed dendrite banded segregation.2, the present invention by control molten steel overheat, pulling rate,
Crystallizer water flow and vibration parameters effectively prevent slab corner to form interdendritic crack defect, eliminate the tight of slab corner
Repeated stick crystalline substance banded segregation.3, φ 5.5~20mm alloy spring steel wire rod of continuous cast method production of the present invention is through dendrite Corrosion monitoring
Without nearly surface layer dendrite banded segregation, metallographic structure uniformity in surface layer after heat treatment, and then improve the fatigue behaviour of spring.
Detailed description of the invention
Fig. 1 is spring cross section segregation defects distributing position schematic diagram；
Wherein, the surface layer 1- dendrite banded segregation；2- pattern segregation；The center 3- negative segregation；The center 4- normal segregation；
Fig. 2 is the nearly surface layer dendrite banded segregation of 1 spring steel wire rod of embodiment, corresponding bloom corner；
Fig. 3 is the nearly surface layer dendrite banded segregation of 1 spring steel wire rod of embodiment, corresponding bloom edge；
Fig. 4 is the nearly surface layer dendrite banded segregation of 1 spring steel wire rod of comparative example, corresponding bloom corner；
Fig. 5 is the nearly surface layer dendrite banded segregation of 1 spring steel wire rod of comparative example, corresponding bloom edge.
Specific embodiment
Present invention will be explained in further detail combined with specific embodiments below.
Embodiment 1
It is band-like partially to eliminate the nearly surface layer dendrite of alloy spring steel wire rod by the present embodiment alloy spring steel wire rod steel grade number 55SiCrV
The continuous cast method of analysis includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, knot
Brilliant device flow of inlet water control and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 15~18 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.65m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 150A, frequency 2.5Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2800L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.7mm, shake frequency 110cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 5.5mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, corresponding bloom corner detection map are shown in Fig. 2 (spring steel wire rod dendrite corrosion of embodiment 2-8 continuous cast method production
Detecting nearly surface layer dendrite banded segregation, to correspond to bloom corner figure similar with Fig. 2, therefore omits)；Corresponding bloom edge detection figure
See that (the nearly surface layer dendrite banded segregation of spring steel wire rod dendrite Corrosion monitoring of embodiment 2-8 continuous cast method production corresponds to generous Fig. 3
Base edge figure is similar with Fig. 3, therefore omits)；Alloy spring steel wire rod is through dendrite Corrosion monitoring without nearly surface layer known to Fig. 2 and Fig. 3
Dendrite banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the suspension spring of the present embodiment alloy spring steel wire rod production, fatigue
Life requirements >=500,000 time, it is 53.2 ten thousand times practical.
Embodiment 2
The present embodiment alloy spring steel wire rod steel grade number 55SiCr eliminates the nearly surface layer dendrite banded segregation of alloy spring steel wire rod
Continuous cast method include the control of the molten steel in bakie in continuous casting degree of superheat, continuous casting billet casting speed control, M-EMS control, crystallization
The control of device flow of inlet water and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 22~25 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.65m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 250A, frequency 2.5Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2600L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.7mm, shake frequency 120cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 20mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the valve spring of the present embodiment alloy spring steel wire rod production, fatigue
Life requirements >=20,000,000 time, it is 21,520,000 times practical.
Embodiment 3
It is band-like partially to eliminate the nearly surface layer dendrite of alloy spring steel wire rod by the present embodiment alloy spring steel wire rod steel grade number 60Si2Mn
The continuous cast method of analysis includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, knot
Brilliant device flow of inlet water control and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 19~22 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.65m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 300A, frequency 1.5Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2700L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.4mm, shake frequency 110cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 13mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the die springs of the present embodiment alloy spring steel wire rod production, tired
Labor life requirements >=300,000 time, it is 32.1 ten thousand times practical.
Embodiment 4
The present embodiment alloy spring steel wire rod steel grade number 55SiCr eliminates the nearly surface layer dendrite banded segregation of alloy spring steel wire rod
Continuous cast method include the control of the molten steel in bakie in continuous casting degree of superheat, continuous casting billet casting speed control, M-EMS control, crystallization
The control of device flow of inlet water and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 17~20 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.70m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 180A, frequency 1.8Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2650L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.5mm, shake frequency 105cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 10mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the suspension spring of the present embodiment alloy spring steel wire rod production, fatigue
Life requirements >=500,000 time, it is 55.7 ten thousand times practical.
Embodiment 5
It is band-like partially to eliminate the nearly surface layer dendrite of alloy spring steel wire rod by the present embodiment alloy spring steel wire rod steel grade number 55SiCrV
The continuous cast method of analysis includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, knot
Brilliant device flow of inlet water control and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 20~23 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.72m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 210A, frequency 2.1Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2720L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.6mm, shake frequency 115cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 15mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the die springs of the present embodiment alloy spring steel wire rod production, tired
Labor life requirements >=300,000 time, it is 31.8 ten thousand times practical.
Embodiment 6
It is band-like partially to eliminate the nearly surface layer dendrite of alloy spring steel wire rod by the present embodiment alloy spring steel wire rod steel grade number 60Si2Mn
The continuous cast method of analysis includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, knot
Brilliant device flow of inlet water control and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 21~24 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.67m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 260A, frequency 2.3Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2780L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.4mm, shake frequency 125cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 7mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite band
Shape segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the valve spring of the present embodiment alloy spring steel wire rod production, fatigue
Life requirements >=20,000,000 time, it is 20,830,000 times practical.
Embodiment 7
It is band-like partially to eliminate the nearly surface layer dendrite of alloy spring steel wire rod by the present embodiment alloy spring steel wire rod steel grade number 55SiCrV
The continuous cast method of analysis includes the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, knot
Brilliant device flow of inlet water control and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 15~17 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.65m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 160A, frequency 1.7Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2610L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.3mm, shake frequency 130cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 20mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the die springs of the present embodiment alloy spring steel wire rod production, tired
Labor life requirements >=300,000 time, it is 34.6 ten thousand times practical.
Embodiment 8
The present embodiment alloy spring steel wire rod steel grade number 55SiCr eliminates the nearly surface layer dendrite banded segregation of alloy spring steel wire rod
Continuous cast method include the control of the molten steel in bakie in continuous casting degree of superheat, continuous casting billet casting speed control, M-EMS control, crystallization
The control of device flow of inlet water and Oscilation Parameters of Mold control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 22~25 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.75m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 280A, frequency 2.3Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2790L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.5mm, shake frequency 100cpm, mold liquid level
Undulated control is in ± 2mm.
The φ 16mm alloy spring steel wire rod of the present embodiment continuous cast method production is through dendrite Corrosion monitoring without nearly surface layer dendrite
Banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Early fatigue fracture does not occur in testing fatigue for the suspension spring of the present embodiment alloy spring steel wire rod production, fatigue
Life requirements >=500,000 time, it is 52.4 ten thousand times practical.
Comparative example 1
This comparative example alloy spring steel wire rod steel grade number 55SiCr, the continuous cast method of alloy spring steel wire rod includes among continuous casting
Baotou steel water superheat control, the control of continuous casting billet casting speed control, M-EMS, the control of crystallizer flow of inlet water and crystallizer
Vibration parameters control process, and specific process step is as described below:
(1) the molten steel in bakie in continuous casting degree of superheat controls: controlling Metal in Tundish overheat by tundish electromagnetic induction heating device
Degree is at 26~30 DEG C；
(2) continuous casting billet casting speed control: crystallizer cross dimensions is 280mm × 325mm, and continuous casting billet casting speed control is in 0.70m/min；
(3) M-EMS controls: M-EMS is mounted on position on the lower side, electromagnetic agitation electric current in the middle part of crystallizer
Intensity is 450A, frequency 1.5Hz；
(4) crystallizer flow of inlet water controls: crystallizer flow of inlet water is controlled in 2500L/min；
(5) Oscilation Parameters of Mold controls: crystallizer uses hydraulic vibration, and amplitude 2.7mm, shake frequency 90cpm, mold liquid level wave
Dynamic control is in ± 3mm.
There are nearly surface layer branches through dendrite Corrosion monitoring for the φ 16mm alloy spring steel wire rod of this comparative example continuous cast method production
Brilliant banded segregation, nearly surface layer dendrite banded segregation correspond to bloom corner and see that Fig. 4, nearly surface layer dendrite banded segregation correspond to bloom
Edge is shown in Fig. 5.
Early fatigue fracture has occurred in the suspension spring of this comparative example alloy spring steel wire rod production in testing fatigue, fatigue
Life requirements >=500,000 time, 19.2 ten thousand times practical, fracture origin is located at nearly surface layer dendrite banded segregation.
The above embodiments are only used to illustrate and not limit the technical solutions of the present invention, although referring to above-described embodiment to this hair
It is bright to be described in detail, those skilled in the art should understand that: still the present invention can be modified or be waited
With replacement, without departing from the spirit or scope of the invention, or any substitutions, should all cover in power of the invention
In sharp claimed range.
Claims (5)
1. a kind of continuous cast method for eliminating the nearly surface layer dendrite banded segregation of alloy spring steel wire rod, which is characterized in that the method
Including the control of the molten steel in bakie in continuous casting degree of superheat, the control of continuous casting billet casting speed control, M-EMS, crystallizer flow of inlet water
Control and Oscilation Parameters of Mold control process；The molten steel in bakie in continuous casting degree of superheat controls process, passes through tundish electromagnetism
Induction heating equipment controls the Metal in Tundish degree of superheat at 15~25 DEG C；The M-EMS controls process, crystallizer
Electromagnetic agitation is mounted on position on the lower side in the middle part of crystallizer, and electromagnetic agitation current strength is 150~300A, 1.5~2.5Hz of frequency；
The Oscilation Parameters of Mold controls process, and crystallizer uses hydraulic vibration, and 2.3~2.7mm of amplitude, shake 100~130cpm of frequency,
Liquid level fluctuation of crystallizer is controlled in ± 2mm.
2. a kind of continuous cast method for eliminating the nearly surface layer dendrite banded segregation of alloy spring steel wire rod according to claim 1,
It is characterized in that, the continuous casting billet casting speed control process, continuous casting billet casting speed control is in 0.65~0.75m/min.
3. a kind of continuous cast method for eliminating the nearly surface layer dendrite banded segregation of alloy spring steel wire rod according to claim 1,
It is characterized in that, the crystallizer flow of inlet water controls process, crystallizer flow of inlet water is controlled in 2600~2800L/min.
4. the nearly surface layer dendrite banded segregation of a kind of elimination alloy spring steel wire rod according to claim 1 to 3
Continuous cast method, which is characterized in that the continuous cast method crystallizer cross dimensions is 280mm × 325mm.
5. the nearly surface layer dendrite banded segregation of a kind of elimination alloy spring steel wire rod according to claim 1 to 3
Continuous cast method, which is characterized in that φ 5.5~20mm alloy spring steel wire rod of the continuous cast method production is through dendrite Corrosion monitoring
Without nearly surface layer dendrite banded segregation, metallographic structure uniformity in surface layer after heat treatment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910808575.9A CN110508771B (en) | 2019-08-29 | 2019-08-29 | Continuous casting method for eliminating dendritic crystal strip segregation near surface layer of alloy spring steel wire rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910808575.9A CN110508771B (en) | 2019-08-29 | 2019-08-29 | Continuous casting method for eliminating dendritic crystal strip segregation near surface layer of alloy spring steel wire rod |
Publications (2)
| Publication Number | Publication Date |
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| CN111363948A (en) * | 2020-04-24 | 2020-07-03 | 浙江大学 | Efficient short-process preparation method of high-strength high-conductivity copper alloy |
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